"This is a teeth-chattering, eyes bulging, shuddering-and-shaking, chills-at-the-back-of-your-neck ghost story. I loved it!"—R.L. Stine, author of the Goosebumps seriesFor fans of Small Spaces and the Goosebumps series by R.L Stine comes a chilling ghost story based on real Chicago history about a malevolent spirit, an unlucky girl, and a haunting mystery that will tie the two together, from the New York Times bestselling author of The Mystery of Locked Rooms.Claire has absolutely no interest in the paranormal. She's a scientist, which is why she can't think of anything worse than having to help out her dad on one of his ghost-themed Chicago bus tours. She thinks she's made it through when she sees a boy with a sad face and dark eyes at the back of the bus. There's something off about his presence, especially because when she checks at the end of the tour…he's gone.Claire tries to brush it off, she must be imagining things, letting her dad's ghost stories get the best of her. But then